Fuse-plug.



G. W. GOODRIDGE. FUSE PLUG. APPLICATION FILED DEC. 22, 1908.

Patented June 1, 1909.

YYSTNESS S 00 MM? 915M;

A TTOR/VEVS un rrnn strains PATEN GILBERT W-. GOODRIDGE, OF BRIDGEPORT,CONNECTICUT, ASSIGNOR TO THE BRYANT ELECTRIC GOIl/lPANY, OF BR-IDGEPORT,

NEGTICUT.

CONNECTICUT, A CORPORATION OF CON- FUSE-PLUG.

No. ceases.-

Specification 01 Letters Patent.

' Patented June'l, 1909.

To all whom it may concern:

Be it known that I, GILBERT W. Goonnrnen, a,c1t1zen. or. the UnitedStates of America, and residing in the city of'Bridge-- port, in thecounty of Fairfield and State of Connecticut, have invented a certainnew and 'lmprovedlusedlug, of which the following 1s aspecification.

My invention relates to electric fuses and articularly to that type offuse commonly own as the standard Edison fuse plug, the object of myinvention being to improve the construction of the same in. theparticulars below mentioned.

In the accompanying drawings in which a fuse plug of the type describedembodying myinventionis shown, Figure 1 is a vertical section of theplug with cap removed and with the fuse strip secured only at the lower"end; Fig. 2 is-a similar section with the up per end of the fuse stripsoldered and the cap in place; Fig. 3 is a horizontal section onthelines 33, Fig. 2;-Fig. 4 is a side el'evation of the plug complete; andFig' 5 is a side elevation of the porcelain alone.

The porcelain employed in the present construction is of the typecommonly used in the Edison plug receptacles and comprises a thread edplug end A, in the lower extremity of which the contact X- is secured.The

usual metallic cap 0 with insulating disk c is crimped vupon theshoulder 13.

' on the outside of the shell, effectively solders i In the customaryconstruction the fuse strip F is carried from the terminal X over thepartition D formed by the recess E and down through the latter to theouter face of the threaded shell G which forms the other terminal of theplug, the shell being offset inwardly into the recess E to facilitatethis arrangement. In

this position the fuse strip is soldered to the shell on the outside ofthe latter. This construction however presents several d1sad vantages.Forexample when the fuse is blown the heat generated is odinarily sulii-1 cient to melt the solder, and the latter-being the plug to thereceptacle in which it is fltted. This makes it very difficult to removethe blown fuse plug for the purpose of ro- 1 placing itbv a fresh one.Again the shell G requently fits the plug end A loosely-owing to thedifliculty in precisely controlling the size of the porcelain duringfiring. Consequently the only thing which prevents the shell fromturning on the plug is the soldered joint between the fuse strip and theshell, the strip being limited in its angular movement by the sides ofthe recess E. But the strain which is put upon the soldered jointbetween the strip and shell when screwing the plug down into itsreceptacle presents dangerous feature in the plug, since the joint mightreadily be loosened and even ruptured in this manner. To avoid thesedisadvan tages, I ropose to carry the shell up straight to the shoulderI), thus forming of the recess E a Well 0 on only at the top. The end ofthe fuse F eing carried down into this well and the solder S poured in,aperfect electrical connection between the shell and fuse strip issecured, while at the same time the solder is kept wholly on the innerface of the shell, and-the disadvantage above mentioned in regard to thesoldering of the plug to the receptacle u on the blowing of the fuse, isavoided. urthermore, if the joint between flows into the threads betweenthe porcelain and shell and renders these rigid with relation to eachother, in effect soldering them together. All strain upon the jointbetween the shell and fuse strip is thereb r eliminated.

' As 'a Whole the fuse plug in t is improved While it presents a muchneater appearance as well as having the advantages pointed out.

I claim as my invention:

1. In a fuse plug of the type described, a hollow insulating bodyprovidcdwith an external shoulder, said bod) having a downwardlyextending recess opening from the interior to a point below saidshoulder on the exterior, in combination with a conducting l shell onsaid body forming in connection with said recessed body a well openingonly into the interior of the-latter to receive the end of a fuse strip,substantially as described.

2. In a fuse plug of the type described, a hollow insulating body.-xl,crnall threaded and shouldered, in combination with a shell i ofconducting material threaded on said body and abutting against saidshoulder. i said insulating body having a downwardly extending recessopening from the interior to a point below said shoulder on the exterior, in combination with a fuse strip one 1 end of which extends intothe well so formed the 'shell and plug end A be loose, the solder formis made as economically as in the past,

between said shell ncl insulating body and l name, to thisspecification, in' the presence of solder lowed mto sand well analcummumcat- 1 two subzscl'llnng witnesses. ing crevices between saidshell and boclv to m T l 1 electrwally umte sand luse stnp to smd shellLBLK Vl Q 5 and t0- rlgidly bmd said shell and body to- I vvltness esz Agather, substmltmlly as dgscnbud. l A J. V-/ ATER110USE,

In mumm whereof I have slgned my 1 H. W. GQLDSBQROUGH.

